Add versions (and other things)

[pladdy]

What's new

• added handler for 'versions' request
  • split up objects handler into objects, object, and versions handlers
• update TODO with more things that i've failed at

How to test

make test

[codecov[bot]]

Codecov Report

Merging #53 into master will increase coverage by 0.27%. The diff coverage is 97.14%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   95.45%   95.73%   +0.27%     
==========================================
  Files          25       28       +3     
  Lines        1693     1757      +64     
==========================================
+ Hits         1616     1682      +66     
+ Misses         44       42       -2     
  Partials       33       33

Impacted Files	Coverage Δ
cabby.go	90.47% <ø> (ø)	:arrow_up:
backends/sqlite/manifest.go	91.3% <ø> (ø)	:arrow_up:
http/requests.go	100% <100%> (ø)	:arrow_up:
http/server.go	100% <100%> (ø)	:arrow_up:
http/object.go	100% <100%> (ø)
http/objects.go	91.42% <100%> (+1.86%)	:arrow_up:
http/responses.go	89.74% <100%> (+1.86%)	:arrow_up:
http/routes.go	100% <100%> (ø)	:arrow_up:
http/versions.go	100% <100%> (ø)
backends/sqlite/sqlite.go	95.42% <100%> (+0.05%)	:arrow_up:
... and 4 more

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